concerning to us. >> someone has her. >> then it happened again. >> she needs to come home. >> another teenager on a sunny afternoon. vanished too. >> she's my angel forever. >> angel, now two gone. where were they and was there lank sf. >> there was mre of a hope that they were somehowconnected. >> tonight the gripping inside story of the disturbing double mystery. >> maybe she's tied up somewher maybe she's being held ptive. >> who could solve it? >> there's a lot of desperation. >> and who was behind it? >> what type of creature would this? >> danger was lurking. >> i was shocked. that warning was not listened to. >> and a mother was bracing for a dramatic moment eye to eye with evil. >> what did you ask him? >> two families, two mysteries. two journeys for justice. >> we just have to find her. ? broad daylight. captions paid for by nbc-universatelevision >>> good evening and welcome to "dateline." i'm ann curry. the heartbreaking double mystery made headlines across the nation and tonight "dateline" has new details on the story of two teenage girls who both disappeared in broad day

i'm lester holt reporting from new york. from all of us here at nbc news, good night. -- captions by vitac -- www.vitac.com nbc-universatelevision >>> it was just a burnt cigarette, but maybe the answer to a mystery. her name was christie. >> i thought, she can't be dead. >> just 25 when she was murdered. >> she was nude. she was bleeding from the head. >> but without much to go on, the case soon grew cold. so few clues. except for that cigarette. was it left behind by her killer? and how could you prove it? >> we had one chance to get this done. >> detectives set a trap, but it's christie who cracks the case. >> christie really solved her own murder. >> the killer caught by the woman he killed, "when the smoke clears." >>> good evening and welcome to "dateline." i'm ann curry. it was a crime that happened 20 years ago, but the detective in charge kept a cold-case file right on the corner of his desk where he could reach it whenever the victim's family called. she was a young woman who had been murdered in her home. detectives thought they knew who had killed her, but they had to

extremely security conscious. >> my dad raised both of us girls to be afraid, to be secure. he made sure we took every precaution to be safe all the time. >> christie lived in a gated complex and kept a loaded gun in her nightstand. she had two locks on her door, secure windows. it didn't make sense. if this had been a robbery, surely there would have been some sign of forced entry. >> there's no broken door, no doorlock pried, no window broken. the house was locked. so, obviously, she let whoever in that did this. >> and given christie's obsession with security, this could mean only one thing. >> whoever killed her was somebody she knew. that was clear. >> shocking? yes, of course. but not necessarily to christie's father, as he told the news media right after the murder. >> christie was a very, very trusting girl. somebody could, a friend of hers or someone from work, or just a friend could come to the door, she'd open it for him. >> a friend? a colleague from work? was it possible christie fleming had been murdered by one of them? >>> coming up, a critical clue based on something christi

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